Fano‐Enhanced Circular Dichroism in Deformable Stereo Metasurfaces,Advanced Materials

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Fano‐Enhanced Circular Dichroism in Deformable Stereo Metasurfaces
Advanced Materials ( IF 27.4 ) Pub Date : 2020-01-16 , DOI: 10.1002/adma.201907077
Zhiguang Liu _{1,

2} , Yi Xu ₃ , Chang‐Yin Ji ₁ , Shanshan Chen ₁ , Xiangping Li ₃ , Xiangdong Zhang ₁ , Yugui Yao ₁ , Jiafang Li _{1,

2}

Affiliation

2D metasurfaces have emerged as a paradigm‐shifting platform for light management with considerable miniaturization and alleviated fabrication challenges than their 3D counterparts. However, the appearance of in‐plane mirror symmetry and reduced dimensions impose fundamental restraints to advanced chiroptical responses and reconfiguration capabilities. Here, a new concept of Fano‐enhanced circular dichroism by introducing a reconfigurable stereo metasurface, which possesses deformable out‐of‐plane twists that are readily achieved by a simple nano‐kirigami fabrication method, is demonstrated. The stereo height and twisting geometries can be reproducibly controlled, providing a facile and automated fashion to tailor the distinct profiles of Fano resonances under circularly polarized incidence. As a result, a recorded high efficiency of circular dichroism generation per unit sample thickness is achieved with Fano resonances in opposite lineshapes. Leveraging this feature, large‐range reconfiguration of circular dichroism at optical wavelengths is demonstrated through reversible compression of the stereo metasurfaces with a fiber tip. The studied stereo metasurface unfolds a new degree of freedom for advanced photonic applications in a quasi‐flat optical platform, and the proposed concept of Fano‐enhanced circular dichroism opens new venues to explore interesting fundamental phenomena of chiral optics.

中文翻译：

变形立体超表面中的纳米增强的圆二色性

2D超表面已经成为光管理的范式转换平台，与3D对应表面相比，具有极大的小型化并减轻了制造挑战。但是，面内镜对称性的出现和尺寸的减小对先进的脊骨反应和重新配置功能施加了根本的限制。在这里，通过引入可重构的立体超表面来展现法诺增强圆二色性的新概念，该表面具有可变形的平面外扭曲，可以通过简单的纳米千纸鹤制作方法轻松实现。立体声高度和扭曲几何形状可以可复制地进行控制，从而提供了一种简便且自动的方式来调整圆极化入射下Fano共振的不同轮廓。结果是，在相反的线形中通过Fano共振可以实现每单位样品厚度的圆二色性生成的记录的高效率。利用此功能，通过用光纤尖端对立体超表面进行可逆压缩，证明了在光波长下圆二色性的大范围重构。所研究的立体超表面为准平面光学平台中的先进光子应用带来了新的自由度，而拟议的Fano增强圆二色性概念为探索手性光学的有趣基本现象提供了新的场所。通过用光纤尖端对立体超表面进行可逆压缩，证明了在光波长下圆二色性的大范围重构。所研究的立体超表面为准平面光学平台中的先进光子应用带来了新的自由度，而拟议的Fano增强圆二色性概念为探索手性光学的有趣基本现象提供了新的场所。通过用光纤尖端对立体超表面进行可逆压缩，证明了在光波长下圆二色性的大范围重构。所研究的立体超表面为准平面光学平台中的先进光子应用带来了新的自由度，而拟议的Fano增强圆二色性概念为探索手性光学的有趣基本现象提供了新的场所。

更新日期：2020-02-24

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